I have to look more deeply into the new proposal for operator&&(), but it seems a little specific. Is there no way that the ideas discussed
operator && is fairly general as it works for any pair of ranges and is composable: v1 && v2 && v3 It also preserves lvalue-ness e.g. boost::copy( v4, boost::begin( v1 && v2 ) ); Either of v1 and v2, here, can be a range of reference wrappers, so, for example, this call to copy could be preceded by BOOST_AUTO(v1,ref_csv(a,b,c)); // v1 is an array of ref-wrappers std::vector<int> v2(2); Internally it uses chain.hpp from RangeEx. By the way, I didn't see it in the latest release, so I've made the file temporarily avail here: http://svn.boost.org/svn/boost/sandbox/statistics/support/boost/range/
here could be made as efficient, requiring a separate operator&&() for chaining? As a user, I would not mind being steered towards the efficient usage if documented properly.
If you have specifics in mind, please let us know. http://svn.boost.org/svn/boost/sandbox/statistics/support/libs/assign/doc/in... Thanks.